Setting Chart Base

I'm very new to Chart Pro and am figuring out a lot of how to use it by the examples which have helped a lot.  I have a chart that I would like to make look like a spectrum analyzer.  This will be a bar chart with negative numbers.  Instead of having the bars go from 0 to -100 say, I'd like for the bar to start at a number like -130 and go up to -100.  I haven't been through all the documentation to see if this is possible, so thought I see if any of the more experienced users have attempted such a chart, or know if there is a way to accomplish this.  It's not a disaster if it can't be done.  But would make the chart look more professional.